This is a freshwater tank right? There is no live rock in a freshwater tank. There is gravel/sand, but it's not live in the same way as live rock/sand in a saltwater tank.
If you can use a siphon hose to suck out 1/4 of the old sand per week, and replace it each week with 1/4 of the new substrate you can change it out like that without too much stress on the inhabitants.
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~ Mindy
SPS fanatic.
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